New battery repeatedly go DEAD every 3-4 weeks even though driven every day

have you had the charging system tested?all connections clean,tight,free of corrosion,including GROUNDS,very important?no cut,frayed wires shorting to ground?with the car off,battery voltage should be around 12.6 volts.with the car running,the battery voltage should be around 13.5-15.0 volts.if all that checks out,copy and past the link............................................................................................................................................... How to Test and Find a Parasitic Battery Drain (Key Off ... Video for parasitic battery drainâ–¶ https://www.youtube.com/watch?v=zdIKNnwEjIs